本文主要向大家介绍了Linux运维知识之Linux配置定时任务的两种方法crontab -e与/etc/crontab及其区别，通过具体的内容向大家展现，希望对大家学习Linux运维知识有所帮助。

Linux配置定时任务，大家都知道使用crontab这个系统功能，但有时候我们需要区分用户执行，下面就直接说一下2种方法的区别：

方法1：

使用命令 crontab -e 然后直接编辑定时脚本。

这样执行以后，属于用户自定义的，会被写到 /var/spool/cron 目录下，生成一个和用户名一致的文件，文件内容就是我们编辑的定时脚本。

如：

[root@localhost cron.d]# cd /var/spool/cron  
[root@localhost cron]# ll  
总用量 4  
-rw-------. 1 root root 52 12月  9 10:58 root  
[root@localhost cron]# pwd  
/var/spool/cron  
[root@localhost cron]# cat root   
30 03 * * * /root/automysqlbackup.sh  

方法2：

使用命令 vi /etc/crontab 编辑定时脚本。

如：

[root@localhost ~]# cat /etc/crontab                                                                                                                                                                        
SHELL=/bin/bash                                                                                                                                                                                             
PATH=/sbin:/bin:/usr/sbin:/usr/bin                                                                                                                                                                          
MAILTO=root                                                                                                                                                                                                 
HOME=/                                                                                                                                                                                                      

# run-parts                                                                                                                                                                                                 
30 * * * * root /usr/sbin/ntpdate 210.72.145.44                                                                                                                                                             
#30 8 * * * root /usr/sbin/ntpdate 132.228.90.101                                                                                                                                                           
01 * * * * root run-parts /etc/cron.hourly                                                                                                                                                                  
02 4 * * * root run-parts /etc/cron.daily                                                                                                                                                                   
22 4 * * 0 root run-parts /etc/cron.weekly                                                                                                                                                                  
42 4 1 * * root run-parts /etc/cron.monthly                                                                                                                                                                 
*/1 * * * * root run-parts /opt/openoffice.org3/program/start.sh                                                                                                                                            
############################################                                                                                                                                                                

30 4 * * * root /usr/bin/rsync -vzrtopg --progress --delete root@192.168.231.35::resource /hyy/bak/resource   
30 4 * * * root /usr/bin/rsync -vzrtopg --progress --delete root@192.168.231.35::log /hyy/bak/log  
############################################  
[root@localhost ~]#   

（系统级的）做系统级配置我们会直接配置 /etc/crontab

（用户级的）一般还是建议大家使用 crontab -e ，这样系统也会帮着检查我们配置的脚本语法。

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